<?php
class Image {

  var $image;
  var $image_type;

  function load($filename) {
    $image_info = getimagesize($filename);
    $this->image_type = $image_info[2];
    if( $this->image_type == IMAGETYPE_JPEG ) {
       $this->image = imagecreatefromjpeg($filename);
    } elseif( $this->image_type == IMAGETYPE_GIF ) {
       $this->image = imagecreatefromgif($filename);
    } elseif( $this->image_type == IMAGETYPE_PNG ) {
       $this->image = imagecreatefrompng($filename);
    }
  }

  function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {
    if( $image_type == IMAGETYPE_JPEG ) {
       imagejpeg($this->image,$filename,$compression);
    } elseif( $image_type == IMAGETYPE_GIF ) {
       imagegif($this->image,$filename);
    } elseif( $image_type == IMAGETYPE_PNG ) {
       imagepng($this->image,$filename);
    }   
    if( $permissions != null) {
       chmod($filename,$permissions);
    }
  }

  function destroy(){
    imagedestroy($this->image);
  }

  function output($image_type=IMAGETYPE_JPEG) {
    if( $image_type == IMAGETYPE_JPEG ) {
//        header('Content-type: image/jpeg');
       imagejpeg($this->image);
    } elseif( $image_type == IMAGETYPE_GIF ) {
//        header('Content-type: image/gif');
       imagegif($this->image);
    } elseif( $image_type == IMAGETYPE_PNG ) {
//        header('Content-type: image/png');
       imagepng($this->image);
    }   
  }

  function getWidth() {
    return imagesx($this->image);
  }
  function getHeight() {
    return imagesy($this->image);
  }

  function maxWidth($width){
    if($width < $this->getWidth()){
      $this->resizeToWidth($width);
    }
  }

  function maxHeight($height){
   if($height < $this->getHeight()){
      $this->resizeToHeight($height);
    }
  }

  function resizeToHeight($height) {
    $ratio = $height / $this->getHeight();
    $width = $this->getWidth() * $ratio;
    $this->resize($width,$height);
  }
  function resizeToWidth($width) {
    $ratio = $width / $this->getWidth();
    $height = $this->getheight() * $ratio;
    $this->resize($width,$height);
  }
  function scale($scale) {
    $width = $this->getWidth() * $scale/100;
    $height = $this->getheight() * $scale/100; 
    $this->resize($width,$height);
  }
  function resize($width,$height) {
    $new_image = imagecreatetruecolor($width, $height);
    imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
    $this->image = $new_image;
  }

  function crop($width,$height){
    $new_image = imagecreatetruecolor($width, $height); 
    imagecopyresampled($new_image, $this->image, 0,0,($this->getWidth() - $width )/2, ($this->getHeight() - $height) /2, $this->getWidth(), $this->getHeight(), $this->getWidth(), $this->getHeight());
    $this->image = $new_image;
  }

  function resizeAndCrop($width,$height){
    if($width == $height){
      if($this->getWidth() > $this->getHeight()){
        $this->resizeToHeight($height);
      }else{
        $this->resizeToWidth($width);
      }
    }elseif($width > $height){
      $this->resizeToWidth($width);
    }else{
      $this->resizeToHeight($height);
    }

    $this->crop($width,$height);
  }

  function createThumb($size){
    $this->resizeAndCrop($size,$size);
  }

  function createThumbWH($h,$w){
    $this->resizeAndCrop($h,$w);
  }

  function stamp($stamp){
    // Set the margins for the stamp and get the height/width of the stamp image
    $marge_right = 10;
    $marge_bottom = 10;
    $sx = imagesx($stamp);
    $sy = imagesy($stamp);

    // Copy the stamp image onto our photo using the margin offsets and the photo 
    // width to calculate positioning of the stamp. 
    imagecopy($this->image, $stamp, imagesx($this->image) - $sx - $marge_right, imagesy($this->image) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp));
  }
}
?>